Innocom Technology(shenzhen) Co., Ltd.

Chimei Innolux Corporation

Innolux Display Corporation

Chemei Innolux Corporation

He-Kang Zhou

Tong Zhou

Jian-Hui Lu

A power supply circuit includes a direct current (DC) voltage source, a protecting circuit having a first switching element, a pulse width modulation (PWM) circuit having a first terminal, a switching circuit, and a transformer. The DC voltage source is configured to provide a first DC voltage. The first terminal is configured to receive the first DC voltage via the first switching element to enable the PWM circuit. The PWM circuit is configured to switch on or switch off the switching circuit. The transformer is configured to convert the first DC voltage to an alternating current (AC) voltage in cooperation with the switching circuit.

Power supply circuit with protecting circuit having switch element for protecting pulse width modulation circuit

An electrical apparatus with an alarm includes an electrical device and an alarm system, the electrical device and the alarm system being both connected to an external power supply. The alarm system includes a wireless communication circuit and a control module. The control module is connected between the external power supply and the wireless communication circuit. The control module controls the wireless communication circuit to send an alarm notification when the electrical device is disconnected from the external power supply.

Electrical apparatus with an alarm system

An exemplary backlight control circuit () includes a DC power supply (VDD), a load circuit (), an input circuit (), and a PWM IC (). The load circuit includes two light sources () and a rectifier and filter circuit (). The input circuit includes a diode () and a capacitor (). The PWM IC includes a current sampling pin () and an overvoltage protection pin (). A low voltage terminal of a first one of the two light sources is connected to the current sampling pin via the rectifier and filter circuit, and a low voltage terminal of a second one of the two light sources is connected to a cathode of the diode. An anode of the diode is connected to the DC power supply and grounded via the capacitor. The overvoltage protection pin is connected to the DC power supply.

Backlight control circuit with input circuit including diode and capacitor

An exemplary backlight driving circuit () a first power supply (); a second power supply (); a signal output terminal (); an AND gate (); a follower (); a capacitor (); a reverser (); a first transistor (), which is a N-Channel mode metal-oxide-semiconductor field-effect transistor (N-MOSFET), having a gate electrode connected to an output end of the AND gate through the follower, a source electrode connected to the signal output terminal, a drain electrode connected to the first power supply; and a second transistor (), which is a N-Channel mode metal-oxide-semiconductor field-effect transistor (N-MOSFET), having a gate electrode connected to the output end of the AND gate through the reverser, a source electrode connected to the ground, a drain electrode connected to the signal output terminal.

Backlight driving circuit with follower and liquid crystal display using same

An LCD driving circuit comprising an over-voltage protection circuit includes an input terminal to receive an input voltage, a voltage-dividing circuit, a voltage-stabilizing circuit including a voltage-stabilizing element, a control circuit, a switching element, and an output terminal. The voltage-dividing circuit provides a reference voltage according to the input voltage to the voltage-stabilizing circuit, the voltage-stabilizing circuit determines whether the voltage-stabilizing element conducts according to the reference voltage, and the control circuit controls the switching element to switch on or off according to a working stage of the voltage-stabilizing element to determine whether the output terminal outputs an output voltage.

Over-voltage protection circuit and LCD driving circuit using the same

An exemplary backlight control circuit () includes at least two sampling circuits (), at least two feedback circuits (), and a PWM IC (). Each of the sampling circuits includes a sampling output () and a backlight lamp (). The PWM IC includes a current sense pin (). The at least two feedback circuits correspond to the at least two sampling circuits, respectively. Each of the feedback circuits includes a resistor () and a diode () electrically coupled in parallel. The sampling output is configured to output a first voltage when the backlight lamp is in a normal working state, and output a second voltage when the backlight lamp has an open circuit. One terminal of the diode is electrically coupled to the sampling output of a corresponding one of the sampling circuits, and an opposite terminal of the diode is electrically coupled to the current sense pin.

Backlight control circuit with feedback circuit

An exemplary backlight modulation circuit () includes a pulse generator circuit () configured for generating a first square pulse; a voltage division circuit () configured for receiving the first square pulse and generating a second square pulse according to the first square pulse; an oscillator circuit () configured for generating a reference voltage; and an amplifier () comprising a negative input configured for receiving the second square pulse from the voltage division circuit, and a positive input configured for receiving the reference voltage from the oscillator circuit as a reference pulse signal, the amplifier being configured for generating a backlight adjusting signal according to the reference pulse signal and the second square pulse.

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Shenzhen, China

He-Kang Zhou